Planetary Addition

There are ten letters used in this simple equation: ( A, E, M, N, P, R, S, T, U, V ).
The letters are substitutions for the numerals 0 - 9.
The substitutions is consistent throughout the puzzle, so, if the A in M A RS is a 1, then the letter A in UR A NUS must also be a 1.
When the correct substitutions are made, the underlying addition problem will be true.
To solve the puzzle: <font color=blue>What seven digit number is represented by the word NEPTUNE?</font color=blue>